A measurement of the {π}{→}e{ν} branching ratio using a NaI(Tl) spectrometer yields a value {Γ}(({π}{→}e{ν})+({π}{→}e{ν}{γ}))/{Γ}(({π}{→}{μ}{ν})+({π}{→}{μ}{ν}{γ}))=(1. 218±{}0.014)×{}10^-4. The result is consistent with expectations of the standard electroweak theory incorporating electron-muon universality.
No takes yet. Share an insight, caveat, or question.
Bryman et al. (1986) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: